Кафедра "Безпека життедіяльності"<br>(з 2022 увійшла до складу кафедри Екологічна та цивільна безпека ДІІТ)
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Кафедра "Безпека життедіяльності"
(з 2022 увійшла до складу кафедри Екологічна та цивільна безпека ДІІТ)
EN: Department "Life Safety"
(з 2022 увійшла до складу кафедри Екологічна та цивільна безпека ДІІТ)
EN: Department "Life Safety"
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Browsing Кафедра "Безпека життедіяльності"<br>(з 2022 увійшла до складу кафедри Екологічна та цивільна безпека ДІІТ) by Author "Horobets, Volodymyr L."
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Item Comparative Tests of Contact Elements at Current Collectors in Order to Comprehensively Assess their Operational Performance(PC "Technology Center", Ukrainian State University of Railway Transport, Kharkov, Ukraine, 2018) Babyak, Mykola O.; Horobets, Volodymyr L.; Sychenko, Viktor G.; Gorobets, YevhenEN: We have studied the interaction between contact elements in the pantographs of electric transport under operation at the sections of railroads powered by direct and alternating current. In contrast to known techniques for bench tests, we investigated the mechanism of current collection and wear resistance at the new testing installation over a minimally narrow region of the sliding contact, simulating the phenomenon of a pantograph “cut”. This installation can be used both industrially when manufacturing new contact elements and under laboratory setting when studying wear resistance. The experimental research confirmed that the wear intensity of contact elements at pantographs depends on current load over a contact area, the magnitude of contact pressure, the area of a contact surface, and motion speed. We have practically proven a possibility to maintain a reliable contact connection in the sliding contact under extreme operating conditions when using a reliable contact material for the current collector pads. It has been proposed to use the powder composition BrIG based on bronze, iron, and graphite, for making contact elements for pantographs that could provide for reliable contact when interacting with the contact wire. Application of new and high-quality contact materials affects the tribology and stability of interaction between plates and the contact wire. Owing to our study, a possibility has been established to manufacture a reliable contact element BrIG, which would prolong the time of interaction in the contact pair “pantograph at electric transport ‒ contact network”. The practical significance of this research relates to the proven efficiency of utilizing the new contact material BrIG for electric railroad transport network, in trolley buses and trams. Thus, one can argue about the possibility to prolong the time of operation for the contact pair “pad in a pantograph at electric transport ‒ contact network” by applying the new contact material BrIG.Item Methods and Results of Evaluating the Dual-Power Electric Train Crew Elements Service Life(IOP Publishing, 2020) Horobets, Volodymyr L.; Sablin, Oleh I.; Fedorov, Yevhen F.; Horobets, Yevhen; Bolotov, Oleksij O.; Jangulova, Olga L.EN: The article assesses the long-term strength of the vibration damper assembly of a double power transmission of electric trains manufactured by «Hyundai-Rotem Company». The technique is described and the analysis of the service life of the elements of the chassis of the electric train is made. The presence and nature of micro cracks in the loaded elements of the vibration damper assembly was evaluated after a full cycle of vibration bench tests. The influence of vertical vibrations of the electric train body on the level of dynamic load and the service life of the bearing elements of the vibration damper assembly is considered. The service life of the vibration damper at the end of the service life has been estimated by comparing working hours and “statistical playback”. The calculation of the resource by the method of "statistical reproduction" confirms the possibility of operating the vibration damping module (second modernization) for 50 years from the date of construction. The influence of the vibration damper position on its dynamic loading is checked. The main stages and sequence of tests for estimation the resource of the longitudinal vibration damper module of a double-fed electric train are also considered, including methodological, calculated and experimental confirmation of the reliability and durability of the unit, which was studied as part of a comprehensive work.Item Study of Car Traffic Flow Structure on Arrival and Departure at the Marshalling Yard X(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2016) Nesterenko, Galina I.; Muzykin, Mykhailo I.; Horobets, Volodymyr L.; Muzykina, Svetlana I.ENG: The paper is aimed to analyse the existing car traffic organization at the marshalling yard aimed to reduce downtime of cars. Methodology. The methods of mathematical statistics allowed building the histogram of car traffic flow distribution at the marshalling yard and assessment of their parameters. The key quantitative and qualitative indicators of the station operation were analyzed. In order to analyze the effect of rehandling volume on the rehandled transit car downtime elements at the station we plotted the dependence graph of the car downtime elements on the rehandling volume. The curve variation on the graph clearly shows the effect of rehandling volume on two downtime elements: during formation and in expectation of operations. Findings. The question of reducing the average downtime of all car categories at the station should be solved by reducing unproductive downtime was proved. The correct determination of the average time spent by a rehandled transit car at the station is essential, especially in the conditions of new system of economic incentives. But still there is no separate methodology for determining the car downtime, which would allow to objectively consider the equipment and operation technology and exclude the possibility for subjective decisions. Originality. One of the main kinds of unproductive downtime during the carriage of goods by rail is a downtime on the marshalling yards in expectation of technological operations because of the system congestion. Reduction of this indicator is possible due to rational use of the marshalling yard capacity provided the rational distribution and car – and train flows between the major marshalling yards of Ukrzaliznytsia. Practical value. The analysis of changes in downtime elements, depending on the rehandling volume allows not only to identify the car downtime reduction methods, but also to make a correct assessment of station staff work, as well as to adjust the rate of idle wagons.Item Working Capacity Research of Track Sections(Silesian University of Tecnology, Katowice, Poland, 2017) Nesterenko, Halyna I.; Muzykin, Mykhailo I.; Horobets, Volodymyr L.; Avramenko, Svetlana I.ENG: Abstract. The paper identifies the problems and ways to implement the measures to increase the working and carrying capacity of railway lines. The analysis of this problem shows that for Ukrainian rail network there is no holistic approach to formalize procedures for calculating the working capacity of track sections taking into account technological features of passage of individual car traffic volumes. In addition, there are few studies of factors that influence the level of working capacity use. This necessitates research in this area, which can be a basis for calculating working capacity of sections depending on the influence of various factors. The main ways to increase the working and carrying capacity of railway lines are to increase the weight and length of the trains. But it is a difficult complex task. When solving this task it should be considered restrictions on the useful length of station tracks, restrictions on the traction force of locomotives, possible reduction of train service speed, and many other additional factors. Increase of the train weight makes it possible to increase the carrying capacity of railway lines on the average by 10-30%. But the problem of train weight is closely connected with analysis of the length of existing receiving and departure tracks on the main directions of train movement of OJSC "Ukrainian Railways." Having analyzed the working capacity reserve at all the existing lines of Dnipropetrovsk Management of Rail Transportations we can conclude that the available working capacity exceeds the required one (the reserve is sufficient).